Both of these red rooms must be connected to at least one non-red room (but it cannot be the same one if it’s the only non-red room both red rooms border with).At least one of these red rooms must be connected to any special room (treasure room, shop, arcade, regular or super secret room etc)besides a boss room.Under normal circumstances, an ultra secret room will be generated between 2 (sometimes more) red rooms. Since red rooms cannot be created in greed mode, ultra secret rooms are limited to regular runs. The Crystal Key trinket opens red rooms too, but you can’t control it so it won’t be very helpful here. Obviously, the most reliable one the Red Key, but you can also use Cracked Key or Soul of Cain. In order to find an ultra secret room, you will need an item/consumable capable of creating red rooms.
This can be circumvented if you have a trinket that allows those rooms to spawn on late-game floors, like the Wicked Crown or Silver Dollar. It looks like ultra secret rooms are generated before the shops and treasure rooms are removed, which sometimes makes them appear in seemingly random spots.
#The binding of isaac rebirth game breaking seeds how to#
This guide will teach you how to find them much more reliably How to Find Ultra Secret Roomsĭue to a bug, as of the current version (v4.0.3), this method is flawed on and after the Womb floor. Most ultra secret rooms contain angel items, making them very rewarding to look for. Repentance added a new type of secret rooms, which can only be found via certain items that are able to create red rooms. Home > Guides > The Binding of Isaac: Rebirth – How to Find Ultra Secret Rooms
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